Solution:

The license may be destroyed by the windows update. In this case, customers can apply for a floating license to use ZW3D, and wait for the expiration of the borrowed license. It will return to the server once it is expired.

For windows 10, our suggestion for all of our users is to update manually instead of auto-updating. Return the license first before updating, and activate again after that. Of course, the floating license will not be affected.